Portable electric welding-tool.



J. w. SHEFFER. PORTABLE ELECTRIC WELDING TOOL.

APPLICATION mum MAY 13, 1912.

UNITED s ATEs PATENT OFFICE.

JOHN W. SHEFFER, 0F BERWICK, PENNSYLVANIA, ASSIGNOR TO AMERICAN CAR ANDFOUNDRY COMPANY, OF ST. LOUIS, MISSOURI, A CORPORATION OF NEW JERSEY.

PORTABLE ELECTRIC WELDING-TOOL.

1'0 all whom it may concern:

tion, though it is to be understood that the invention is not limited tothe exact details of construction shown and described, as it is obviousthat various modifications thereof will occur to persons skilled in theart.

In said drawings: Figure 1 represents a sectional side view of a handelectric welding tool. Fig. 2 is a front view of the same showing theelectric contact faces of the tool. Fig. 3 represents a fragmentalsection of Fig. 1 on the lines 38 looking in the direction of the arrow.

This invention comprises in its adaptation a portable hand electricwelding tool, and comprehends an electric welding tool comprising twoelectrodes insulated from each other, the one being attached to andinsulated from a suitable handle and the other being movable upon thefirst electrode, and carrying a tip provided with fastener recesses, allarranged so that the tool can be held in one hand and operated by theother. The fixed electrode is attached to the handle and adapted to beheld in contact with the metal side wall and the movable electrodeoperating thereon and carrying the fastener is'so spaced asto be heldout of contact with the side wall; An electric switch is providedpreferably controlled by the foot of the operator for supplying thecurrent to the electrodes.;- This device forms a welding tool small,compact and capable of being employed with great facility.

.To describe this invention more in detail: The stationary electrode 4is provided with a depending projection 5 and an insulated handle 6. Thestationary elect-rode also carries perforated supports7, 7 lined withinsulation through which the movable electrode 8 slides. The stationaryelectrode is also provided with a perforation lined with insulation inwhich operates a guide 12 for the movable electrode.

Specification of Letters Patent. Patented Nov, 26, 1912, Applicationfiled May 13, 1912.

Serial No. 697,092.

The movable electrode comprises a flat removable portion 9 carryingperforation 11 for the insertion of the shank of the nail or fastener, amain'body portion 10 carrying the guide 12, and a shank 13 attached toan ope-rating handle 15, which is insulated from the said shank. Theportion 9 is made removable so that other forms of headed fasteners maybe used by altering the shape of the perforations 11 therein. electrodeis normally held in rearward position or out of cont-act with the metalwall by the spring 14:, operating upon a shoulder 16 secured to theshank 13 thereof between insulated supports 7, 7.

The two electrodes are separated by suitable insulation. A high tensionlow volume current is supplied by the alternator 17 and reduced to a lowtension, large volume current through the step-down transformer 18, thesupply cables being attached to the electrode terminals-5 and 12. Aprimary switch 19 is provided in the circuit preferably controlled bythe foot of the operator.

In the use of this device the operator grasps the handle 6 that carriesthe stationary electrode 1 and forces the same against the plate shownin dotted lines in Fig. 1, the primary switch 19 is then thrownintoroperative position by the foot the operating handle 15 of themovable electrode 10 moved forward by'theright hand of the operatoruntil the head of the fastener or nail, which is shouldered against themovable face 9 of this electrode, contacts with the sheet therebycompleting the electric circuit through the fastener and the movableelectrode. reached a welding heat, pressure is applied by the right handof the operator upon the handle 15 and the nail head upset and forcedinto the metal sheet. Removable face 9 is provided with a large numberof perforations so that the nail can be positioned with greater.facility.

It is obvious that the mechanical detail of the device can be changed,but in practice the device shown in the drawing has proved effective forthe purpose for which it was designed.

What I claim is:

1. A tool of the class described, comprising a stationary electrodearranged for -making contact with a metal wall, a movle electrodearranged to carry a fastener,

Assoon as the nail head has The movable, 5

an electric current supply and means for completing the electric circuitthrough the metal wall and the fastener.

2. A tool of the class described, comprising a stationary electrodearranged for mak ing contact with-a metal wall, an electric currentsupply and means arranged to carry a fastener and for completing theelectric circuit through the fastener and welding the same to the metalwall.

3. A tool of the class described, comprising a stationary electrodearranged for making contact with a metal wall provided with a handle, amovable electrode provided with a fastener holder, an electric currentsupply and means for operating the movable electrode and completing theelectric circuit through the fastener.

4;. A tool of the class described, comprising a stationary electrodearranged for making contact with a metal wall provided with a handle andwith insulated guides for a movable electrode, a movable electrodearranged to carry a fastener operating upon. the stationary electrode,an electric current supply and means for operating the movable electrodeand completing the electric circuit through the fastener.

5. A tool of the class described, comprising a stationary electrodearranged for making contact with a metal wall, a movable electrodearranged to carry a fastener, an electric current supply and resilientmeans for maintaining the electric circuit open.

6. A tool of the class described, compris ing a stationary elect-rodearranged for making contact with a metal wall, provided with insulatedguides for a movable electrode, a movable electrode provided with aremovable fastener holder arranged to carry a fastener, an electriccurrent supply, means attached to the movable electrode for completingthe electric circuit through the fastener and resilient means forautomatically breaking the electric circuit. 7

7 A tool of the class described, comprising a stationary electrodearranged for making contact with a metal wall provided with an insulatedhandle and with insulated guides for a movable electrode, an electriccurrent supply, a movable electrode operating upon the stationaryelectrode and provided with a removable fastener holder arranged tocarry a fastener, an operating shank and a handle and a spring locatedon the shank for normally maintaining the electric circuit open.

8. A tool of the class described, comprising a stationary electrodearranged for making contact with a metalwall, a movable electrodearranged to carry a fastener, an electric current supply, means forcompleting the electric circuit through the fastener and means forcontrolling the electric current.

In witness whereof I have hereunto set my hand in the presence of twowitnesses.

JOHN W. SHEFFER.

Witnesses:

FRED A. HOLLMAN, HENRY F. TRAUGH.

